What do dogs think about their owner’s smell? Unfortunately, we can’t ask them. So instead, researchers at Emory University, USA decided to find out what happens inside a dog’s brain when it smells a familiar human.

Yawning is contagious. When we see another person yawn, we are much more likely to do so ourselves. In humans, this is thought to be a sign of empathy: the more empathetic you are, the more likely you are to catch someone else’s yawn. But what about catching yawns between species?